How it Works
National Semiconductor
Loading...
DM7446A
Technical data
6 pgs122.52 Kb0

National Semiconductor DM7446A Technical data

Download
查询DM5447A供应商
DM7446A, DM5447A/DM7447A BCD to 7-Segment Decoders/Drivers
General Description
The 46A and 47A feature active-low outputs designed for driving common-anode LEDs or incandescent indicators di­rectly. All of the circuits have full ripple-blanking input/out­put controls and a lamp test input. Segment identification and resultant displays are shown on a following page. Dis­play patterns for BCD input counts above nine are unique symbols to authenticate input conditions.
All of the circuits incorporate automatic leading and/or trail­ing-edge, zero-blanking control (RBI and RBO). Lamp test (LT) of these devices may be performed at any time when the BI/RBO node is at a high logic level. All types contain
June 1989
an overriding blanking input (BI) which can be used to con­trol the lamp intensity (by pulsing) or to inhibit the outputs.
Features
Y
All circuit types feature lamp intensity modulation capability
Y
Open-collector outputs drive indicators directly
Y
Lamp-test provision
Y
Leading/trailing zero suppression
DM7446A, DM5447A/DM7447A BCD to 7-Segment Decoders/Drivers
Connection Diagram
Dual-In-Line Package
TL/F/6518– 1
Order Number DM5447AJ, DM7446AN or DM7447AN
See NS Package Number J16A or N16E
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
TL/F/6518
Absolute Maximum Ratings (Note)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications.
Supply Voltage 7V
Input Voltage 5.5V
Operating Free Air Temperature Range
DM54 DM74 0
Storage Temperature Range
b
55§Ctoa125§C
Ctoa70§C
§
b
65§Ctoa150§C
Note:
The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaran­teed. The device should not be operated at these limits. The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings. The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation.
Recommended Operating Conditions
Symbol Parameter
V
CC
V
IH
V
IL
V
OH
I
OH
I
OL
I
OL
T
A
Supply Voltage 4.75 5 5.25 V
High Level Input Voltage 2 V
Low Level Input Voltage 0.8 V
High Level Output Voltage (a thru g) 30 V
High Level Output Current (BI/RBO)
Low Level Output Current (a thru g) 40 mA
Low Level Output Current (BI/RBO) 8 mA
Free Air Operating Temperature 0 70
Min Nom Max
’46A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
e
V
I
V
OH
I
CEX
V
OL
I
I
I
IH
I
IL
I
OS
I
CC
Note 1: All typicals are at V
Note 2: I
Input Clamp Voltage V
High Level Output V Voltage (BI/RBO) I
High Level Output V Current (a thru g) V
Low Level Output V Voltage V
Input Current@Max V Input Voltage (Except BI/RBO)
High Level Input V Current (Except BI/RBO)
Low Level Input V Current V
Short Circuit V Output Current
Supply Current V
is measured with all outputs open and all inputs at 4.5V.
CC
CC
CC
e
OH
CC
e
IL
CC
e
IH
CC
CC
CC
e
I
CC
CC
e
e
5V, T
CC
A
(Note 2)
25§C.
eb
e
Min, I
Min
12 mA
I
Max
e
Max, V
e
e
e
e
e
Max, V
Min, I
Min, V
Max, V
Max, V
30V
O
e
Min
IH
e
Max
OL
e
Max
IL
e
5.5V
I
e
2.4V
I
Max BI/RBO
0.4V
e
Max (BI/RBO)
e
Max
Others
DM7446A
Typ
(Note 1)
b
0.2 mA
b
Units
C
§
Max Units
1.5 V
2.4 3.7 V
250 mA
0.3 0.4 V
1mA
40 mA
b
4
b
1.6
b
4mA
60 103 mA
mA
2
’46A Switching Characteristics
at V
CC
e
5V and T
e
25§C (See Section 1 for Test Waveforms and Output Load)
A
Symbol Parameter Conditions Min Max Units
t
t
PLH
PHL
Propagation Delay Time C Low to High Level Output R
Propagation Delay Time High to Low Level Output
e
15 pF
L
e
120X
L
100 ns
100 ns
Recommended Operating Conditions
Symbol Parameter
V
CC
V
IH
V
IL
V
OH
I
OH
I
OL
I
OL
T
A
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
High Level Input Voltage 2 2 V
Low Level Input Voltage 0.8 0.8 V
High Level Output Voltage (a thru g)
High Level Output Current (BI/RBO)
Low Level Output Current (a thru g)
Low Level Output Current (BI/RBO)
Free Air Operating Temperature
DM5447A DM7447A
Min Nom Max Min Nom Max
15 15 V
b
0.2
b
40 40 mA
88mA
b
55 125 0 70
0.2 mA
’47A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
e
V
I
V
OH
I
CEX
V
OL
I
I
I
IH
I
IL
I
OS
I
CC
Note 1: All typicals are at V
Note 2: I
Input Clamp Voltage V
High Level Output V Voltage (BI/RBO) I
High Level Output V Current (a thru g) V
Low Level Output V Voltage V
Input Current@Max V Input Voltage
High Level Input Current V
Low Level Input V Current V
Short Circuit V Output Current
Supply Current V
is measured with all outputs open and all inputs at 4.5V.
CC
CC
CC
e
OH
CC
e
IL
CC
e
IH
CC
CC
CC
e
I
CC
CC
(Note 2)
e
e
5V, T
CC
25§C.
A
eb
Min, I
e
Min
Max
e
Max, V
Max, V
e
Min, I
Min, V
e
Max, V
e
Max, V
e
Max BI/RBO
0.4V
e
Max (BI/RBO)
e
Max DM54 60 85
12 mA
I
2.4 3.7 V
e
15V
O
e
Min
IH
e
Max
OL
e
Max
IL
e
5.5V
I
e
2.4V 40 mA
I
Others
DM74 60 103
Typ
(Note 1)
Max Units
b
1.5 V
250 mA
0.3 0.4 V
1mA
b
4
b
1.6
b
4mA
Units
C
§
mA
mA
3
’47A Switching Characteristics
at V
CC
e
5V and T
e
25§C (See Section 1 for Test Waveforms and Output Load)
A
Symbol Parameter Conditions Min Max Units
t
t
PLH
PHL
Propagation Delay Time C Low to High Level Output R
Propagation Delay Time High to Low Level Output
e
15 pF
L
e
120X
L
100 ns
100 ns
Function Table
46A, 47A
Decimal or Inputs BI/RBO Outputs
Function
LT RBI D C B A
(Note 1)
abcdef g
0 H H LLLL H LLLLLLH 1 H X LL LH H HLLHHHH
2 H X LLHL H L LHLLHL 3 H X LLHH H LLLLHHL
4 H X LHLL H HLLHHLL 5 H X LHLH H LHL LHLL
6 H X L HHL H HHL L L L L 7 H X L HHH H LL LHHHH
8 H X HLLL H LLLLLLL 9 H X HLLH H LLLHHLL
10 H X HLHL H HHHLLHL 11 H X HLHH H HHLLHHL
12 H X HHL L H H LHHHL L 13 H X HHLH H LHH LH L L
14 H X HHHL H HHH L L L L 15 H X HHHH H HHHHHHH
BI X X X XX X L HHHHHHH (3)
RBI H L L L L L L HHHHHHH (4)
LT L X XXXX H LLLLLLL (5)
Note 1: BI/RBO is a wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO).
Note 2: The blanking input (BI) must be open or held at a high logic level when output functions 0 through 15 are desired. The ripple-blanking input (RBI) must
be open or high if blanking of a decimal zero is not desired.
Note 3: When a low logic level is applied directly to the blanking input (BI), all segment outputs are high regardless of the level of any other input.
Note 4: When ripple-blanking input (RBI) and inputs A, B, C, and D are at a low level with the lamp test input high, all segment outputs go H and the ripple-
blanking output (RBO) goes to a low level (response condition).
Note 5: When the blanking input/ripple-blanking output (BI/RBO) is open or held high and a low is applied to the lamp-test input, all segment outputs are L .
e
H
High level, LeLow level, XeDon’t Care
Note
(2)
4
Logic Diagram
Physical Dimensions inches (millimeters)
TL/F/6518– 2
16-Lead Ceramic Dual-In-Line Package (J)
Order Number DM5447AJ
NS Package Number J16A
5
Physical Dimensions inches (millimeters) (Continued)
16-Lead Molded Dual-In-Line Package (N)
Order Number DM7446AN or DM7447AN
NS Package Number N16E
DM7446A, DM5447A/DM7447A BCD to 7-Segment Decoders/Drivers
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user.
National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.
1111 West Bardin Road Fax: ( Arlington, TX 76017 Email: cnjwge@tevm2.nsc.com Ocean Centre, 5 Canton Rd. Fax: 81-043-299-2408 Tel: 1(800) 272-9959 Deutsch Tel: ( Fax: 1(800) 737-7018 English Tel: (
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
Fran3ais Tel: ( Italiano Tel: (
a
49) 0-180-530 85 86 13th Floor, Straight Block, Tel: 81-043-299-2309
a
49) 0-180-530 85 85 Tsimshatsui, Kowloon
a
49) 0-180-532 78 32 Hong Kong
a
49) 0-180-532 93 58 Tel: (852) 2737-1600
a
49) 0-180-534 16 80 Fax: (852) 2736-9960
Loading...
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use